How to Deal with Misfire in Cylinder 2 of the Engine?
2 Answers
If it is an independent ignition system, you can swap the ignition coil with another cylinder, clear the fault code, and then use it for a while before ignition. This helps determine the faulty part. For example, if after swapping the ignition coils between cylinders 2 and 4, the misfire moves to cylinder 4, then it is 100% an ignition coil issue. More information about the engine is as follows: 1. The principle of the engine is: A four-stroke gasoline engine mixes air and gasoline in a certain proportion to form a good mixture, which is drawn into the cylinder during the intake stroke. The mixture is compressed, ignited, and burned to produce thermal energy. The high-temperature and high-pressure gas acts on the top of the piston, pushing the piston to perform reciprocating linear motion, and mechanical energy is output externally through the connecting rod, crankshaft, and flywheel mechanism. 2. Composition: The engine consists of two major mechanisms—the crank-connecting rod mechanism and the valve train—and five major systems, including cooling, lubrication, ignition, fuel supply, and starting systems. The main components include the cylinder block, cylinder head, piston, piston pin, connecting rod, crankshaft, flywheel, etc. The working chamber of a reciprocating piston internal combustion engine is called the cylinder, and the inner surface of the cylinder is cylindrical. The piston that reciprocates in the cylinder is hinged to one end of the connecting rod through the piston pin, while the other end of the connecting rod is connected to the crankshaft. The crankshaft is supported by bearings on the cylinder block and can rotate within the bearings, forming the crank-connecting rod mechanism. When the piston reciprocates in the cylinder, the connecting rod drives the crankshaft to rotate.
A friend of mine has run an auto repair shop for over a decade, specializing in engine misfire issues. Cylinder 2 misfires are particularly common, and the first step is usually to check the ignition system. Open the engine hood, unplug the ignition coil connector for cylinder 2, and check for cracks or oil stains. Last time, my car had this exact issue—replacing the ignition coil fixed it immediately. Spark plugs are another key area to inspect; remove them to check if the electrodes are eroded or have excessive carbon buildup. Clogged fuel injectors can also cause misfires, and using a borescope to inspect fuel spray patterns is the most direct method. If all these components are normal, consider low cylinder compression, which could be due to poor valve sealing or worn piston rings. Don’t underestimate misfire problems; ignoring them long-term can damage the catalytic converter, leading to much costlier repairs. Using an OBD scanner to check specific trouble codes can save a lot of time—diagnose the issue properly before taking action.
